At Power Delivery Block Diagram; Non-Used 3.3V Pins On Som Connector - Advantech SOM-ETX Series Design Manual

Advantech SOM-ETX Design Guide

6.2.2 AT Power Delivery Block Diagram

AT power source will provide 12V , 5V power ,The additional switching regulator or
LDO will be required to simulate the ATX power (3.3V...) .There will be no standby
voltage once AT power source be used.
12V
SOM-ETX
AT Power Source
5V
3.3V
Switching regulator or LDO
12V
POWER
OUT
Figure 6-2 AT Power Delivery Block Diagram

6.2.3 Non-used 3.3V Pins on SOM Connector

SOM-ETX provides the 3.3V voltage on ETX connector PinA12, A16,A24. However ,
right now Advantech SOM-ETX module did not support this 3.3V output. An
additional switching regulator or LDO will be required to provide the 3.3V on carried
board.
Chapter 6 Power Delivery Guidelines 117